Fix issue #71

[hpwxf]

For windows, allocator/deallocator must be in the same module (cf blog post)
Thus, Numpy arrays cannot be allocator by numpy and deallocated by armadillo.
To fix that, steal_copy_array has been rewritten to be able to build numpy arrays using data allocated by armadillo.
This behavior is set using allow_foreign_allocator variable in steal_copy_array.

Unfortunately, VS 16 (2019) seems to not enable NRVO inside p_arr_to_cube function. This implies Cube object copy (including internal data) when strict is true. That's why, two tests have been disabled on WIN32 in test_arr_to_mat_native.cpp.

[RUrlus]

Thanks for finding and solving the bugs, much appreciated.

[hpwxf]

Thanks for finding and solving the bugs, much appreciated.

It wasn't exactly a "pleasure" and it was somewhat delicate and interesting. I appreciated a lot 😉